xym 2013 Cheapest Variable Voltageelectronic cigarettevariable voltage ego-c twistThe eGo Twist eGo C Twist Battery is another advanced version based on eGo original battery. Modified the circuit to enable the adjustment of output voltage from 3.2V to 4.8V as the lithium battery power decrease. With a smart Buck-Boost converter inside, you can spin the knob atthe bottom to adjust the output voltage depend on your need. A fully charged eGo Twist eGo-C Twist variable voltage battery can support you 6 hours, it takes 2-3 hours to be fully charged using fast USB charger for eGo/eGo-T/eGo-C! Using the battery at a higher voltage output will drain the battery quicker than when using it at a lower voltage. How to adjust the output voltage of eGo Twist Battery?Advantages:1.no tar and other carcinogenic substance.